| abstract |
A lithium ion secondary battery excellent in cycle characteristics is provided. A lithium ion secondary battery comprising a positive electrode, a negative electrode, a separator, and an electrolytic solution, wherein the positive electrode has a current collector and a positive electrode mixture agent formed on the current collector, wherein the positive electrode mixture mixture comprises a layered lithium nickel / manganese / cobalt composite oxide, A lithium ion secondary battery comprising aluminum oxide coated with carbon. |